Stucco (Plaster)
Definition:
A type of light, malleable plaster made from dehydrated lime (calcium carbonate) mixed with powdered marble and glue and sometimes reinforced with hair. It sets more slowly than regular plaster and so is suitable for crafting sculpture and architectural decoration, external and internal. Differs from most other plasters which are made with calcium sulfate, rather than the calcium carbonate used in stucco, and set much more quickly.
Definition Source:
Getty AAT